[IAUC] IAUC 9171: COMET 103P/HARTLEY; C/2009 U10-U12; 245P; NOTICE TO SUBSCRIBERS [25139-2011/04-R1]

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                                                  Circular No. 9171
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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COMET 103P/HARTLEY
     N. Dello Russo and R. J. Vervack, Jr., Applied Physics
Laboratory, Johns Hopkins University; and H. Kawakita and H.
Kobayashi, Kyoto Sangyo University, report the detection at
infrared wavelengths of the parent volatile molecules H_2O, CH_3OH,
C_2H_6, and HCN in comet 103P on Sept. 16.3-16.5 UT using NIRSPEC
at the W. M. Keck Observatory.  C_2H_2 was tentatively detected,
and CH_4 was searched for but not detected.  For an aperture of
0".42 x 1".74 centered on the nucleus, the authors obtained a water
rotational temperature of 57 +/- 7 K, based on twenty-one detected
H_2O emissions.  Production rates or upper limits (x 10^25
molecules/s) for Sept. 16 are:  H_2O, 410 +/- 40; CH_3OH, 4.3 +/-
0.4; C_2H_6, 2.0 +/- 0.2; CH_4, < 2.0 (3-sigma); HCN, 1.5 +/- 0.2;
C_2H_2, 0.7 +/- 0.1.  Preliminary production-rate ratios are then
H_2O:CH_3OH:C_2H_6:CH_4:HCN:C_2H_2 = 100:1.0:0.5:(<0.5):0.4:0.2.
Compared to other comets, production-rate ratios in 103P on this
date are within the normal range for CH_3OH, C_2H_6, and C_2H_2
-- while CH_4 and HCN are slightly depleted and enhanced,
respectively.


COMETS C/2009 U10-U12 (SOHO)
     Further to IAUC 9170, additional near-sun comets have been
found on SOHO website images -- presumed Kreutz sungrazers except
for C/2009 U10 (Marsden group), which was marginally diffuse (peak
mag about 7.5).  K. Battams notes that C/2009 U11 was slightly
diffuse with a "slight" tail, and C/2009 U12 was very diffuse with
a "large" tail (mag about 5).

 Comet        2009 UT       R.A.(2000)Decl.   Inst.  F    MPEC
 C/2009 U10   Oct. 22.321   13 44.8  -12 54   C3/2  BZ   2010-L45
 C/2009 U11        22.696   13 39.3  -12 31   C3/2  BZ   2010-L45
 C/2009 U12        25.113   13 28.3  -15 12   C3/2  MK   2010-L45


COMET 245P/WISE
     Comet P/2010 L1 = P/2002 Q16 (cf. IAUCs 9151, 9166) has been
given the permanent designation 245P.


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                      (C) Copyright 2010 CBAT
2010 September 30              (9171)            Daniel W. E. Green